Spring back rest for automatic grinders



Jan. 5 1926.

1,568,673 c. KNOWLES SPRING BACK REST FOR AUTOMATIC GRINDERS v Filed August '7, 1922 &

2 Sheets-Sheet 1 C'. KN OWLES SPRING BACK REST FOR AUTOMATIC GRINDERS Filed Aug "7. 1922 2 Sheets-Sheet 2 INVENTOR. Can/10% M -1 BY W5 "ATTORNEY Patented Jan. 5, 1926.

UNITED STATES PATENT OFFICE...

cannon. xnowms, or mn'rroan, cormacrrcu'r, ASSIGNOR To run a warrant COMPANY, 01 NEW YORK, N. Y., A CORPORATION OFNEW JERSEY.

I SPRING BACK BEST FOR AUTQIATIC GBINDEBS.

Application har 1, 1922. Serial no. 500,200.

To all whom it may concern:

Be it known that I, CARROLL KNOWLES, a citizen of the United States, residing -at Hartford, in the county of Hartford and 5 State of Connecticut, have invented certain new and useful Improvements in Sprin a Back Rests for Automatic Grinders, 0

which the following is a specification.

This invention relates to work supports for grinding machines and in articular to a work support or back rest a apted-to engage cylindrical work while it is being ground.

An object of the present invention is to provide a back rest'which, during operation on the work by .the wheel, will resiliently engage and support the work in operative position and which may be automaticall withdrawn from engagement with the wor when the wheel slide and wheel are moved to inoperative position.

One feature which enablesme to accomplish the above object, is that I pivotally;

mount a member adapted tocontact wit and support work whi e it is being ground, the member being adapted to, swing upon an axis parallel to the axis ofthe work and, by means attached to the wheel slide, positively-oscillate the work supporting member 80 away from its work engaging position when the wheel slide is moved awayfrom the '2 work.

' movement of the wheel slide toward operative position permits return movement of the back rest into work engaging position.

Another object of the invention is to pro- I vide resilient means in the form of a sprirg support adapted to be resllientl held-incontact with the work during t e normal grindlng operation and automatically withtion of blanks w ile the wheel These means are so arranged that was d on drawn from operative position when the artlcle belng ground 15 automatically released and another blank automatically advanced into position in themachineu' In applications' to machines not havingautoniatic blank supplying mechanism, the movement of the back restv from operative position 1 simultaneously with movements of the wheel slide permits read and rapid manual inserslide is in its inoperative position.

With these and other objects in view', my

invention consists in the features of construction and operation set forth in the followmg specification and illustrated in the accompanying drawings. I In the accompanymg drawings annexed hereto and forming a part of this specification, I have shown my invention embodied in an automatic broad wheel grinding machine, but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as defining or limitmg the scope of the invention, the claims appended to th s specification being relied upon for that purpose. a

In the drawmgszf o Figure 1 isa side view of the work support or back rest in, position on acylindrical grindlngmachine.

F g. 21s a front view of the same.

Fig. 3.71s aside view'of the'back rest on an enlarged scale, parts being shown in section to moreclearly define this construction. F g. .1s a vertical sectionalview taken online 44 of Fig. 3.

sup to t e work.

In the above mentioned drawings,-I have" shown but one embodiment of. the invention which is now deemed referable, but'it is to be understood that 'clianges and modificatrons ma be made within thescope of the appende claims without departing from the spirit of the invention.

Briefly, my invention in its pect comprises in addition to the usual mechanisms of a cylindrical grinding ma chine the following,eprincipal parts: first, a sup ortmg mem justa 5 isa plan view of the work support. Fig. 6 1s a fragmentary View of the work. rt n its inoperative position'relat'ive ada ted. to be ad-, 1 secured to the wor table; second, a mem 1 preferably pivotally mounted at" broadest asto vary its pressure,

the upper portion of the supporting member and having a work contacting member adjustably secured thereon; third, resilient means, the pressure of which may be adjusted to force the work engaging member toward the work being ground; fourth, adjustable means for limiting the movement of the work support toward the work; and fifth, an oscillating shaft mounted on the support having an arm engaging the work support and another arm adapted to be associated with the wheel slide so that positive oscillating movements will be imparted to the work supporting member by movement of the wheel slide out or operative position and the support permitted to move to its operative position upon movement of the wheel slide in the other direction.

Referring more in detail to the figures of the drawings, 1 provide a support having two side members 11 and 12 extending thereirom, this support being adopted to be adjustably secured to the work supporting tabis 13 by means of the bolts shown in Figs. 1 and 3. Mounted between the upright members 11 and 12 of the support 10 and adapted to oscillate about the axis o1 a transverse shaft 1 1 is a back rest or work engaging member 15. This member 15 has on one of its surfaces an adjustable block 16, one portion of which is adapted to contact with the work A. being ground. Screws 1? and 17 engaging the oscillating membenlfa and the block 16 are provided for ad usting the position of this block 16. Another screw 18 is provided for clamping the block 16 in any desired adjustment. The above parts are similar in every way to those described 1n my copendin application, Serial No. 580,266 filed August Z, 1922, so that further description thereof is not thought to be necessary.

in order to resiliently force the work engaging member 15 toward the airis of the work A, during the normal operation or the machine, a spring 19 is provided disposed between a ber 15 and a shoulder or" an adjusting screw 22 threaded into a projection 21 on the supporting member 10 therefor. In order to retain this spring 19 in operative position and an adjusting screw 22 is mounted in the projection 21. A lock nut 23 on the adjusting screw 22 provides means for securely locking the adjusting screw in any desired position. Preferably, this screw 22 is provided with an extension 24 around which the spring 19 may be disposed, the forward end of this projection 24: being adapted to extend freely within a hole provided within the oscillating member 15.

To adjust the pressure of the spring 19 so that the back rest block 16 may be held against the work A with varying degrees of pressure, it is only necessary to rotate the screw 22 thus forcing the spring 19 to a more suriiace on the oscillating memreduced to its predetermined size at which time the oscillating member 15 is moved as far as possible toward the axis of the work A. In order to adjust the work engaging position .of the oscillating member 15, the rod 28 is provided with a threaded portion extending through a threaded portion of the oscillating member and is provided with a graduated dial 30 on its forward end. This dial 30 is adjacent a pointer 31 secured to the oscillating member 15 so that fine adjustments of this rod may be made to slightly vary the limit of movement of the oscillating member 15 to accurately adjust the osition of the work engaging surface 0 the block 16. A spring 32 housed within the oscillating member and surrounding the adusting screw or rod 28 prevents slight movements of the screw due to looseness or lost motion between the threaded portions.

It will be seen from the above described mechanism that l have provided an oscillating work engaging and supporting member 15, the movement of which toward the axis the work A being ground is adjustable within fine limits. Also the force with which th s member may be urged toward the work amsls adjustable by the adjustment of the tension of spring 19 between the oscillating member 15 and its support 10, In addition the block 16 on this oscillating member 15 may be. positioned to adapt it for work of diii'erent diameters or to take up the amount it has been worn away As it is essential in automatic grinding machines for which this invention is particularly adapted that the work support be withdrawn from its operative or work engaging position when the work blanks are being removed and replaced, ll provide automatic means preferably associated with the wheel slide for withdrawing the oscillating member 15 away from the axis of the 'work.

As the wheel 35 and wheel slide 36 are necessarily moved away from their operatwo or advanced position with the removal and replacement of work blanks, I preferably make use of the movement of the wheel slide 36 to simultaneously move the work support 15. As shown, the connections between the wheel slide 36 and work support 15 are such that movement of the wheel slide 36 away from operative position positively oscillates the work support or back rest 15 nseaevs away from its operative work engagin .po.- sition. Movement of the wheel slide 36 ack to its operative or advanced position permits the work support 15 to be resiliently advanced toward its operative position by the force of the actuating spring 19.

Preferably the movements of the wheel slide 36 are entirely automatic as described. in my copending application. As the present invention is not dependent upon automatic operation of the wheel slide 36, the mechanism by which its movements are controlled has not been described or shown in this application.

The means operatively connecting the back rest or supporting member 15 with the wheel slide 36 comprise an oscillating shaft 40 having an arm 41 extending therefrom ada ted to be in engagement with a vertical sur ace on the oscillating member 15 when the member 15 is being oscillated. Preferably, during grinding, the arm 41 does not contact with the oscillating member 15. Another arm 42 on this oscillating shaft 40 depending therefrom is connected to a rod 43 outstanding from and adjustably attached to the wheel slide 36. As the longitudinal position of the wheel slide 36 may be varied relative to the depending arm 42, I form this depending arm with a longitudinally extending rod 44 which may be engaged by the member 45 outstandingfrom the wheel slide 36 at any point in its length. i

As shown in Fig. 1, the connection between the rod 43 outstanding from the wheel slide 36 and the rod 44 on the depending arm 42 is adjustable. Preferably the endof rod 43 is threaded and the member 45 adjustably threaded thereon. A- lock nut 46 on the threaded end of the rod 43 holds the member 45 in any adjusted position.

The parts above described are adapted to be used in association with a sizing de- -vice contained within the enclosed portion 50 adjacent the supporting; member 15 of the type described in my copending application Serial No. 587,158 filed September 9, 1922. This mechanism is provided with a feeler arm 51 having its ends adapted'to contact with the work A. This arm is preferably pivoted-about the axis of theshort rod 14 about which the supporting member 15 oscillates.

The operation of the mechanism is substantially as follows: When the blank A is moved into its operative position on the centers as shown in Fig. 2 of the drawings, the wheel 35 and the slide 36 on which it is carried is in retracted position. The rod 43 is therefore retracted and lever 42 oscillated to move lever 41 in a counterclockwise direction. The lever 41 therefore presses against and moves the support 15 and the members mounted thereon away from the axis on which the blank is mounted. During the grinding operation during which the wheel 35 is advanced to blank engaging position, the rod 43 is also advanced so that lever 41 is moved in a clockwise direction thus moving away from the support 15. This support 15 therefore is free to move into contact with and resiliently support the work blank A.

What I claim is:

1 A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work, a back rest adapted to contact with and support work in operative position during the grinding operation, and means to withdraw the back rest from operative position when said wheel slide is moved awa from the work.

2. A cylindrical grinding machine comprising 1n combination, a base, work supporting and rotating means thereon, a- I wheel carrying slide movable toward and from the. work, a pivotally mounted back rest adapted contact with and support work in operative position during the grind ing operation, and means to swing the back rest from operative position when said wheel shdeus moved away from the work.

3. A cylindrical grinding machine com-- pris ng in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work, a back rest adapted to contact with and support work in operative position during the grinding operation, and means to withdraw the back rest from operative position when said wheel slide is moved away from thework, said means permitting the back rest to move into operative position when the wheel slide is advanced toward the work.

4. A cylindrical grindin machine compris ng in combination, a ase, work sup- POItIIIg' and rotating means thereon, a wheel carrying slide movable toward and from the wor a pivotally mounted back rest adapted to contact with and support work in operative position during the grinding operation, and means to swing the back rest from operative position when said to i-simultaneously wit movement of the wheel I the wheel slide is in its advanced position v wheel slide to withdraw the back rest from operative position when the wheel slide is moved away from the work.

-6. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work, a back rest adapted to contact with and support work in operative position during the grinding operation, and adjustable means connected to and moved by the wheel slide to withdraw the back restfromopera- 7 tive position when the wheel slide is moved away from the work.

7. A. cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carr ing slide movable toward and from the wor a back rest adapted to contact with and support work inoperative position during the grinding operation, resilient means normally forcing the work rest toward its operative position, and means operated by movement of the wheel slide to cause movement of said back rest out of operative position in accordance with the movement of the wheel slide away from the work.

8. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work, a back rest adapted to resiliently contact with and support work in operative p0- sition during the grinding operation, and means connected to the wheel slide ermitting engagement of the back rest with the work while the wheel slide is in its advanced osition and positively" withdrawing the ack rest from en agement with the work slide from its advanced position.

9, A cylindrical rinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work,apivotally mounted back rest adapted to contact with and support work in operative'position during the grinding operation, a spring normally forcing the back rest to-.

nected to the wheel slide permitting engagement of the back rest with the work. while and positively swinging the back rest away ,fromengagement with the work simultaneously with movement of the wheel slide from I its advanced position.

g in combination, a base, work sup- 'porting and rotatin means thereon, a wheel shaftadjacent said work supporting and Y0! ward the work, and adjustable means con-' noeacra tating means having an arm in engagement with the back rest, and another arm on said shaft adapted to be connected to the wheel slide, whereby movement of said wheel slide imparts movement to saidback rest out of operative position.

11. A cylindrical grinding machine comprising in combination, a base, work supporting and rotating means thereon, a wheel carrying slide movable toward and from the work, a pivotally mounted back rest adapted to contact with and support workin operative position during the grinding operation, a spring normally forcing said back rest to its operative position, an oscillatable shaft adjacent said work supporting and rotating means having an arm in engagement wltn the back rest, and another arm on said shaft in engagement with the back rest, and an-- other arm on said shaft adapted to be adjustably connected to the wheel slide, wherebymoveinent of said wheel slide may impart a positive swinging movement to said back rest in one direction and permit it to swing back.

13. A work support for cylindrical grinding machines comprising in combination, a support, a movable ack rest thereon adapted to contact with and support work in operative position during the rinding 0 eration, and means adapted to e engage by a partmoving with the wheel of the machine to withdraw the back rest from operative position when the wheel is withdrawn from the'work.

14. A work support for cylindrical grinding machines comprising in combination, a-

support, a pivotally mounted back rest thereon adapted to contact with and-support work in operative position during the grindingo oration, and means adapted to be engage by a part moving with the wheel of the machine to simultaneously withdraw the 10. A cylindrical grinding machine comback rest from operative position as the wheel is withdrawn from the work. v

15. A work supportfor cylindrical grinding machines comprisin in combination, a support, a movable adapted to contact with and support work in operative nsition. during the grinding operation, resiient means normally forcing ck rest thereon the back rest toward the work, and means adapted to be-engaged by a part moving with the wheel of the machine to withdraw the back rest from operative position when the wheel is withdrawn from the work.

16. A work support for cylindrical grinding machines comprisin 'in combination, a support, a movable back rest thereon adapted to. contact with and support work in operative position during the grinding operation, and means adapted to be engaged by a part movable with the wheel of the ma' chine to permit said back rest to contact with while said wheel is in engagement with and the work while said wheel is in engagement with and operating on said work and adapted to positively withdraw the back rest from operative position when the wheel is withdrawn from the work.

17. Awork support for cylindrical grinding machines comprising in combination, a support, a member pivoted thereon adapted to contact with and support work in operative position during the grinding operation, and means engaged bythe wheel slide to swing said member from its operative osition when the wheel slide is withdrawn rom the work.

18. A work support for cylindrical grinding machines comprising in combination, a support, a movable back rest thereon adapted to contact with and support work in operative position during the grinding operation, a spring normally forcing the back rest toward its operative position, and

means engaged by and movable simultaneously with the wheel to permit said back rest to contact with and support the work operating on said work and adapted to swing the back rest from its operative position when the wheel is withdrawn from the work.

19. A work support. for cylindrical grinding machines comprising in combination, a

support, a pivotally mounted back rest thereback rest toward its operative position, and

means adapted to be moved by the wheel to permit said back rest to contact with and support the work while said wheel is in engagement with and operating on said 'work an adapted to positively swing the back rest from its operative position when the wheel is withdrawn from the work.

20. A work support for cylindrical grinding machines comprising in combination, a support, a movable back rest thereon adapted to contact with and support work in operative position during the grinding operation, means normally forcing the back rest toward the work, means to positively limit the movement of the back rest toward the work, and means adapted to be moved by the wheel slide to withdraw the back rest from operative osition when the wheel is withdrawn from t e work.

21. A work support for cylindrical grinding machines comprising in combination, a support, a pivotally mounted back rest thereon adapted to contact with and sup ort work in operative position during the grand moved by the wheel slide to withdraw the back rest from operative position when the wheel is withdrawn from the work.

In testimony whereof, I hereto afiix my signature.

CARROLL KNOWLES. 

